Fix link to docs

The md-pages branch is no longer used, we should link to the docs in the
master branch instead.

Bug: Issue 10629
Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I21c7f7d0f7516632a55f2d8940fa32212f480a7d
diff --git a/_data/topnav.yml b/_data/topnav.yml
index 3c2d648..d27e5a1 100644
--- a/_data/topnav.yml
+++ b/_data/topnav.yml
@@ -28,4 +28,4 @@
         - title: Latest
           external_url: https://gerrit-documentation.storage.googleapis.com/Documentation/2.16.7/index.html
         - title: Wiki
-          external_url: https://gerrit.googlesource.com/homepage/+/md-pages/docs/
+          external_url: https://gerrit.googlesource.com/homepage/+/master/pages/site/docs/